AR-15 5.7x28mm Barrel & BCG Kits – CMMG
5.7x28mm
Turn an AR-15 into a 5.7x28mm with CMMG parts: barrel and bolt carrier group kits using CMMG radial delayed blowback in 5", 8" and 16.1" lengths, a 10.4" barrel, and CMMG MK4/AR-15 5.7x28mm 32-round magazines.
5.7x28mm is a light, flat-shooting cartridge with low recoil, popular in short AR pistols. Check each listing for what is included (barrel only or barrel + BCG).
FAQ
Do I need special magazines?
Yes. 5.7x28 uses its own magazines, such as the CMMG MK4/AR-15 5.7x28mm 32-round magazine.
What does radial delayed blowback mean?
It is CMMG's bolt design that delays the bolt opening without a gas system, which keeps recoil low and the system simple.
CMMG 5.7x28mm 5" Barrel & BCG Kit | Radial Delayed Blowback
The CMMG 5.7x28mm 5" Barrel and BCG Kit provides a compact barrel-and-bolt system for compatible AR-..
-11%
CMMG 5.7x28mm 8" Barrel & BCG Kit | Radial Delayed Blowback
The CMMG 5.7x28mm 8" Barrel and BCG Kit combines the two core CMMG components for a compatible AR-pl..
-10%
Combo Deal: AR-15 CMMG 16.1" Barrel and BCG Kit 5.7x28mm – Perfect for AR Builds
Build your custom AR-15 with the CMMG 16.1" 5.7x28mm Barrel and Bolt Carrier Group (BCG) Kit. This c..
MAG CMMG MK4/AR15 5.7X28MM 32RD
This CMMG magazine fits CMMG MK4/AR15, takes 5.7x28mm and holds 32 rounds. Key details Brand: CMMG..
CMMG BBL 5.7X28 10.4
The CMMG is a barrel in 5.7x28mm with a 10.4" barrel. Key details Brand: CMMGType: BarrelCaliber: ..
CMMG BBL AND BCG KIT 5
The CMMG and BCG Kit is a barrel in 5.7X28MM with a 5" barrel. Key details Brand: CMMGModel: and B..
CMMG BBL AND BCG KIT 8
The CMMG and BCG Kit is a barrel in 5.7X28MM with an 8" barrel. Key details Brand: CMMGModel: and ..